/*global unescape, define, module */

;
(function($) {
    'use strict'

    /*
     * Add integers, wrapping at 2^32. This uses 16-bit operations internally
     * to work around bugs in some JS interpreters.
     */
    function safe_add(x, y) {
        var lsw = (x & 0xFFFF) + (y & 0xFFFF)
        var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
        return (msw << 16) | (lsw & 0xFFFF)
    }

    /*
     * Bitwise rotate a 32-bit number to the left.
     */
    function bit_rol(num, cnt) {
        return (num << cnt) | (num >>> (32 - cnt))
    }

    /*
     * These functions implement the four basic operations the algorithm uses.
     */
    function md5_cmn(q, a, b, x, s, t) {
        return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
    }

    function md5_ff(a, b, c, d, x, s, t) {
        return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t)
    }

    function md5_gg(a, b, c, d, x, s, t) {
        return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t)
    }

    function md5_hh(a, b, c, d, x, s, t) {
        return md5_cmn(b ^ c ^ d, a, b, x, s, t)
    }

    function md5_ii(a, b, c, d, x, s, t) {
        return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
    }

    /*
     * Calculate the MD5 of an array of little-endian words, and a bit length.
     */
    function binl_md5(x, len) {
        /* append padding */
        x[len >> 5] |= 0x80 << (len % 32)
        x[(((len + 64) >>> 9) << 4) + 14] = len

        var i
        var olda
        var oldb
        var oldc
        var oldd
        var a = 1732584193
        var b = -271733879
        var c = -1732584194
        var d = 271733878

        for (i = 0; i < x.length; i += 16) {
            olda = a
            oldb = b
            oldc = c
            oldd = d

            a = md5_ff(a, b, c, d, x[i], 7, -680876936)
            d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586)
            c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819)
            b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330)
            a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897)
            d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426)
            c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341)
            b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983)
            a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416)
            d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417)
            c = md5_ff(c, d, a, b, x[i + 10], 17, -42063)
            b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162)
            a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682)
            d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101)
            c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290)
            b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329)

            a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510)
            d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632)
            c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713)
            b = md5_gg(b, c, d, a, x[i], 20, -373897302)
            a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691)
            d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083)
            c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335)
            b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848)
            a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438)
            d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690)
            c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961)
            b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501)
            a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467)
            d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784)
            c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473)
            b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734)

            a = md5_hh(a, b, c, d, x[i + 5], 4, -378558)
            d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463)
            c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562)
            b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556)
            a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060)
            d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353)
            c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632)
            b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640)
            a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174)
            d = md5_hh(d, a, b, c, x[i], 11, -358537222)
            c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979)
            b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189)
            a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487)
            d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835)
            c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520)
            b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651)

            a = md5_ii(a, b, c, d, x[i], 6, -198630844)
            d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415)
            c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905)
            b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055)
            a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571)
            d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606)
            c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523)
            b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799)
            a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359)
            d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744)
            c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380)
            b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649)
            a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070)
            d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379)
            c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259)
            b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551)

            a = safe_add(a, olda)
            b = safe_add(b, oldb)
            c = safe_add(c, oldc)
            d = safe_add(d, oldd)
        }
        return [a, b, c, d]
    }

    /*
     * Convert an array of little-endian words to a string
     */
    function binl2rstr(input) {
        var i
        var output = ''
        for (i = 0; i < input.length * 32; i += 8) {
            output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF)
        }
        return output
    }

    /*
     * Convert a raw string to an array of little-endian words
     * Characters >255 have their high-byte silently ignored.
     */
    function rstr2binl(input) {
        var i
        var output = []
        output[(input.length >> 2) - 1] = undefined
        for (i = 0; i < output.length; i += 1) {
            output[i] = 0
        }
        for (i = 0; i < input.length * 8; i += 8) {
            output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32)
        }
        return output
    }

    /*
     * Calculate the MD5 of a raw string
     */
    function rstr_md5(s) {
        return binl2rstr(binl_md5(rstr2binl(s), s.length * 8))
    }

    /*
     * Calculate the HMAC-MD5, of a key and some data (raw strings)
     */
    function rstr_hmac_md5(key, data) {
        var i
        var bkey = rstr2binl(key)
        var ipad = []
        var opad = []
        var hash
        ipad[15] = opad[15] = undefined
        if (bkey.length > 16) {
            bkey = binl_md5(bkey, key.length * 8)
        }
        for (i = 0; i < 16; i += 1) {
            ipad[i] = bkey[i] ^ 0x36363636
            opad[i] = bkey[i] ^ 0x5C5C5C5C
        }
        hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8)
        return binl2rstr(binl_md5(opad.concat(hash), 512 + 128))
    }

    /*
     * Convert a raw string to a hex string
     */
    function rstr2hex(input) {
        var hex_tab = '0123456789abcdef'
        var output = ''
        var x
        var i
        for (i = 0; i < input.length; i += 1) {
            x = input.charCodeAt(i)
            output += hex_tab.charAt((x >>> 4) & 0x0F) +
                hex_tab.charAt(x & 0x0F)
        }
        return output
    }

    /*
     * Encode a string as utf-8
     */
    function str2rstr_utf8(input) {
        return unescape(encodeURIComponent(input))
    }

    /*
     * Take string arguments and return either raw or hex encoded strings
     */
    function raw_md5(s) {
        return rstr_md5(str2rstr_utf8(s))
    }

    function hex_md5(s) {
        return rstr2hex(raw_md5(s))
    }

    function raw_hmac_md5(k, d) {
        return rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))
    }

    function hex_hmac_md5(k, d) {
        return rstr2hex(raw_hmac_md5(k, d))
    }

    function md5(string, key, raw) {
        if (!key) {
            if (!raw) {
                return hex_md5(string)
            }
            return raw_md5(string)
        }
        if (!raw) {
            return hex_hmac_md5(key, string)
        }
        return raw_hmac_md5(key, string)
    }

    if (typeof define === 'function' && define.amd) {
        define(function() {
            return md5
        })
    } else if (typeof module === 'object' && module.exports) {
        module.exports = md5
    } else {
        $.md5 = md5
    }
}(this))
